Pressure sensitive on both sides for a temporary hold to both the applique and background materials; pieces stay in place and are repositionable until fused with an iron. Once fused the bond is permanent. Machine wash and dry and dry cleanable. Strong enough to bond different kinds of materials such as cardboard jeans ultrasuede and other heavy fabrics. Unfinished edges will never lift or fray and you can sew through without gumming up your needle.